Library: Input/output
Header
The header <fstream> is part of the Input/output library of the C++ Standard Library. It defines the class templates basic_filebuf, basic_ifstream, basic_ofstream, and basic_fstream, and the types filebuf, wfilebuf, ifstream, wifstream, ofstream, wofstream, fstream, and wfstream as aliases for specializations of the class templates on char and wchar_t.
namespace std {
template <class charT, class traits = char_traits<charT> >
class basic_filebuf;
typedef basic_filebuf<char> filebuf;
typedef basic_filebuf<wchar_t> wfilebuf;
template <class charT, class traits = char_traits<charT> >
class basic_ifstream;
typedef basic_ifstream<char> ifstream;
typedef basic_ifstream<wchar_t> wifstream;
template <class charT, class traits = char_traits<charT> >
class basic_ofstream;
typedef basic_ofstream<char> ofstream;
typedef basic_ofstream<wchar_t> wofstream;
template <class charT, class traits = char_traits<charT> >
class basic_fstream;
typedef basic_fstream<char> fstream;
typedef basic_fstream<wchar_t> wfstream;
}
basic_filebuf, basic_ifstream, basic_ofstream, basic_fstream
ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.8.1